Common reversal mechanisms and correlation between transient domain states and field sweep rate in patterned Permalloy structures

J. W. Lau; M. Beleggia; Y. Zhu

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Common reversal mechanisms and correlation between transient domain states and field sweep rate in patterned Permalloy structures

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摘要

Complicated domain configurations generated during the magnetization reversal of Permalloyelements patterned in various shapes are the results of a surprisingly few switching mechanisms. By comparing the results from micromagnetic simulations with the experimentally observed switching events imaged by Lorentz microscopy, we found that nucleation and annihilation of vortices and vortex/antivortex pairs, and the propagation of Neel and cross-tie walls are common mechanisms for magnetization reversal in Permalloy elements with dimensions favorable to domain formation. In addition, for a given element, different mechanism combination(s) may transpire, depending on the sweep rate in the externally applied field. This is because energy maxima and minima are generally field dependent and that different field sweep rate alters the time allotted for thermally assisted transition between states.

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来源
《Journal of Applied Physics》 |2007年第4期|043906-1-043906-6-0|共6页
作者
J. W. Lau; M. Beleggia; Y. Zhu;
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作者单位

Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类应用物理学;计量学;
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Common reversal mechanisms and correlation between transient domain states and field sweep rate in patterned Permalloy structures

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